Drag and drop that tab onto the Home button
on your toolbar (it's on the left side by default).

Click Yes on the prompt to set this page as your home page.

Set your home page through Firefox optionspreferences

Click the menu button and choose Options.Preferences.

Choose the General panel.

The default Startup setting for When Firefox starts is to show your home page. You can also choose from the drop-down menu to have Firefox show a blank page or to show your windows and tabs from your last session.

You can set multiple pages as your home page. Open each page in a separate tab and click on Use Current Pages under Home PageHome pageHome page.

Click the menu button and choose Options.Preferences.

Click the Home panel.

Click the menu next to Homepage and new windows and choose an option to show either the Firefox Home page, enter your own URLs or show a blank page.

Restore the default home page

If you want to delete your home page customizations, this is how to do it:

Click the menu button and choose Options.Preferences.

Select the General panel.

In the Startup section under Home PageHome pageUnder Home page, click Restore to Default.

Close the about:preferences page. Any changes you've made will automatically be saved.